Nasu (Naisu, Eastern Yi), or Nasu proper, is a Lowoish wanguage spoken by a qwarter miwwion Yi peopwe of China. Nasu proper and Wusa Nasu are two of six Yi wanguages recognized by de government of China. Unwike most written Yi wanguages, Nasu proper uses de Powward (Miao) script. A distinct form of de Yi script was traditionawwy used for Wusa, dough few can stiww read it.

Most of Yi peopwe of de Luqwan area do not have de autonym Luowuo and Nasu (transwiterated into Chinese as 纳苏) means "bwack", hence de Bwack Yi (黑彝 Hei Yi),[10] dough Bwack Yi is an aristocratic caste distinction among de Yi Peopwe, and Bwack Yi Script (Heiyiwen) was a Latin script for Yi introduced by missionaries.[11]

In his description of de Yi script (not de spoken wanguage) Huáng Jiànmíng (1993) howds dat de Nasu variety of Yi script is used by de groups speaking wanguages of de Nasu wanguage cwuster of Nordern Yi in souf-eastern Sìchuān, eastern Yúnnán, Gùizhōu, as weww as in Guǎngxī.[13] He distinguishes two sub-groups. Nasu proper used in Wuding, Luqwan and de suburbs of Kunming, and Wusa used in Guizhou and de bordering areas of Eastern Yunnan, uh-hah-hah-hah.

^Nadan Hiww Medievaw Tibeto-Burman Languages IV 2012- Page 450 "The Nasu variety is used by de groups speaking wanguages of de Nasu wanguage cwuster of Nordern Yi in de souf-eastern part of Sìchuān, de eastern part of Yúnnán, Gùizhōu, as weww as in Guǎngxī. Huáng Jiànmíng (1993: 152)"